#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
int g_val = 100;
int main()
{
    printf("我是一个进程,pid:%d,ppid:%d\n",getpid(),getppid());
    
    pid_t id = fork();
    if(id == 0)
    {
        //child
        while(1)
        {
            printf("我是子进程,pid:%d,ppid:%d,g_val=%d,&g_val = %p\n",getpid(),getppid(),g_val,&g_val);
            g_val++;
            sleep(1);
        }
    }
    else
    {
        //parent
        while(1)
        {
            printf("我是父进程,pid:%d,ppid:%d,g_val=%d,&g_val = %p\n",getpid(),getppid(),g_val,&g_val);
            sleep(1);
        }
    }
    
    return 0;
}
